Create a new group layer, and then try to move a paint layer in the group layer and krita crashes. Reordering layers by drag and drop seems to have the same effect.
SVN commit 831599 by langkamp: fix crash after dragging a layer into a group layer CCBUG: 162881 M +3 -1 kis_node_manager.cpp WebSVN link: http://websvn.kde.org/?view=rev&revision=831599
Can you test if the bug is fixed now?
*** Bug has been marked as fixed ***.